NJ7P SQL Tube Database Query

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1AD4
Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 1AH4 1AK4

Mechanical Data

Bulb .......................................... T-2x3
EIA Outline ................................... 2-1
EIA Base ...................................... 1AD4

Electrical Data

Heater Voltage ................................ 1.25 DC V
Heater Current ................................ 0.1 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 4.5 pf
Output ........................................ 4.5 pf
Grid to Plate ................................. 0.01 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 45 V
Grid No. 2 Voltage ............................ 45 V

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 45 V
Grid No. 2 Voltage ............................ 45 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 500K Ω
Transconductance .............................. 2000 µ
Plate Current ................................. 3 mA
Grid No. 2 Current ............................ 0.8 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Tue, 21 Mar 2023 03:23:12 -0700